Novel Microstructures for Shock Survivability
Abstract
A series of plate impact experiments were conducted to measure the Hugoniot and unloading response of additively manufactured solid and porous polymer specimens, and to determine if the orientation along which a specimen is printed leads to a measurable effect on the shock response. This equation of state data was utilized to calibrate a finite element model that was used to study the propagation of compression waves through the porous polymer specimens. Comparisons of the experimental and model results were used to study the effect of engineered porosity (i.e. different void geometries) on shock mitigation and attenuation. The results show that the polymer studied exhibits some viscoelastic response, and has aquadratic Us- up Hugoniot relation which could be reduced to a linear relation if a greater degree of uncertainty was acceptable. The print orientation of the material does appear to affect the Hugoniot, but does not affect the unloading behavior. The finite element model was used to screen hundreds of potential geometries for their shock response and potential use as a shock diode. The results of that screening indicate that pore (or void) geometry not only has a measurable effect on the attenuation and propagation of compression waves, but that asymmetric void geometries can display directional behavior. However, no true shock diode response was observed.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2019
- Accession Number
- AD1075282
Entities
People
- Christopher Neel
- David Lacina